Originally Posted by dmcdmc

zero loss is just SRAM jargon for the shift being made when you push the shifter, rather than push and release.

An analogy is if you click down a mouse button but dont release it, the click isn't completed. Zero loss means the shift is made on contact...with the click, not when you release the lever. Small difference but noticeable if you care about things like that.

btw all sram groups have zero loss on the front shifter, only red has it in the rear shifter...the tech is in the shifter, not in the derailleurs. only diff between apex, rival, force and red is weight...except for the rear red shifter which has the zero loss.

in the end it comes down what you're used to.